Rosalyn Solomon, QMI Agency

Held at the Mandalay Bay Events Center in Las Vegas on Saturday, the headliner features a women's bantamweight bout between Ronda Rousey and Sara McCann.

Here's five more things you need to know about UFC 170.

DRUG CONTROVERSY

Jessica Eye, who meets Alexis Davis in another women's bantamweight bout, faced quite a bit of controversy leading up to this card, apologizing for a positive drugs test issued by the Texas Department of Licensing and Regulation. The test was conducted after her UFC 166 win against Sarah Kaufman and a report from TDLR showed she tested positive for cannabis.

Both Rousey and McMann are former Olympians; Rousey took bronze in Judo at the 2008 Beijing Games, while McMann won silver in freestyle wrestling at the 2004 Turin Games. Daniel Cormier, who is making his light heavyweight debut, also competed in the 2008 Olympics in freestyle wrestling.

QUICK SNUB

Patrick Cummins, who faces Daniel Cormier, is making his UFC debut. The 6-foot-2, 205-pounder took it on 10 days notice after 34-year-old Rashad Evans announced he couldn’t compete because of a knee injury.

CANADIAN COMEBACK

Canadian welterweight Rory MacDonald faces off against Damian Maia. MacDonald, a Quesnel, B.C., native, is coming off only his second professional loss. He dropped a split decision to Robbie Lawler at UFC 167 last November.